Lovely music and cute art (especially that ending screen!)
Works with the theme, and well designed. Once I got the hang of it, the levels didn't get that challenging until the last two, but all the levels were fun figuring out.
A very small criticism, but one easy to fix, is the lack of a full screen option. My applications at the bottom of the screen covered a small amount of the game screen. Yes, I realize this is just nitpicking.
Anyway, I think this game is quite intuitive and stands out compared to some other games of this genre, with a convenient, obvious, and easy to use command system, and the ability to speed up the movement.
All in all, this is a well designed puzzle game that fits the theme and brings its own charm. Good job!